Mike Tyson is sharing more details about his health scare right before he was supposed to fight Jake Paul over the summer. The boxing legend, 58, “became nauseous and dizzy due to an ulcer flare up 30 minutes before landing” in L.A., his rep previously said after he made headlines. “A week and a half ago I was training and I was doing great,” he recalled in a new Netflix documentary. “Then I started feeling tired. I was explaining to my trainer, I don’t know what is wrong with me.” “Then coming here from Miami on the plane, I went to the bathroom and I threw up blood. The next thing I knew I w…